 |
Test scope |
Test connection
|
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
Left/right audio power
amplifier (N40/3)
Voltage supply |
9  |
N40/3
 |
 26 |
Disconnect connector on N40/3.
Radio (A2): OFF |
11 - 14 V |
Fuse F1-C,
Fuse in N40/3,
Ground (W12),
Wiring,
Values OK:
1.1 ,
|
| 1.1 |
Control voltage from radio (A2) |
9 |
N40/3
|
8 |
Disconnect connector on N40/3.
Radio: ON |
11 - 14 V
|
Wiring,
Radio (A2) (see section 3.1  23 ),
2
|
| 2.0 |
Left/right audio power
amplifier (N40/3)
Speaker signal from radio (A2)
left front:
right front: |
10
1
|
N40/3
|
18
2
|
Disconnect N40/3.
Turn volume control to maximum.
Radio: ON |
> 0.2 V~
Short surges permitted |
Wiring,
Radio (see section 3.1 23 ).
AD82.60-P-6000 in WIS |
| 3.0 |
Left front door speaker
group (H4/1) |
9
9
21 |
|
|
Disconnect N40/3.
Radio (A2): OFF
Connect signal generator (voltage change results in audio volume changes ; frequency change results in tone changes)
Set frequencies between 100 and 10,000 Hz
Set voltage at around 2 V |
 
Different frequencies can be heard from the speaker group |
Wiring,
H4/1,
Values OK:
Replace N40/3.
|
| 4.0 |
Left rear speaker (H4/7) |
16
9
9 |
|
|
Disconnect N40/3.
Radio (A2): OFF |
3.2
|
Wiring,
H4/7,
Values OK:
Replace N40/3.
|
| 5.0 |
Right front door speaker
group (H4/2) |
9
9
14 |
|
|
Disconnect N40/3.
Radio (A2): OFF
Connect signal generator (voltage change results in audio volume changes ; frequency change results in tone changes)
Set frequencies between 100 and 10,000 Hz
Set voltage at around 2 V |
Different frequencies can be heard from the speaker group |
Wiring,
H4/2,
Values OK:
Replace N40/3.
|
| 6.0 |
Right rear speaker (H4/8) |
17
9
9 |
|
|
Disconnect N40/3.
Radio (A2): OFF |
3.2
|
Wiring,
H4/8,
Values OK:
Replace N40/3.
|
| 7.0 |
Acoustimass® bass module (H4/17) |
15
9
9 |
|
|
Disconnect N40/3.
Radio (A2): OFF |
0.8
|
Wiring,
H4/17,
If nominal values are OK:
Replace N40/3.
|
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